This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Any substance added to something in order to thicken it; a thickening agent.

n. One who or that which thickens; specifically, in calico-printing, a substance used to give to the mordant or the dye such consistency as will prevent it from spreading too much, or to add to the weight of the fabric in the process of dyeing.

n. any material used to thicken

"Arrowroot starch is a low-glycemic thickener which is great for the South Beach Diet."

stuff    material   

urea    uroscopy    creatin    alginate    creatinine